Tkinter button callback return value Tkinter是Python中最常用的图形用户界面(GUI)库之一，它提供了丰富的组件和工具，便于我们创建各种用户界面。 Dec 14, 2017 · 質問したいことはタイトルのとおりです。 tkinterを使用してGUIアプリを作成している途中でどうしてもわからないことが出てきたので、助言をいただきたいところです。 質問するためにだいぶ端折 Oct 3, 2022 · In this article, we are going to write a Python script to change the color of the button in Tkinter. Simple, right? Let’s break it down with an example. Unable to return value from callback function of a button in Python Tkinter. cget('command') which I think both are equivalent to Sep 22, 2021 · How to return value from tkinter button callback. var1) self. 7 on Windows 7. entry. pack(side=TOP) self. Mar 17, 2021 · I am (for some elaborate setup reasons) trying to retrieve the actual command callback function from tkinter widgets, for example setting up a callback for a button b. from tkinter import Tk, Button variable = 1 def make_something(value): global variable variable = value root = Tk() Button(root, text='Set value to four',command=lambda *args: make_something(4)). pack() Button(root, text='Set value to eight',command=lambda The following creates the Exit button: exit_button = ttk. Ask Question Asked 11 years, 11 months ago. entry = Entry(self. Dec 10, 2012 · How to return value from tkinter button callback. trace is deprecated. Apr 28, 2022 · You can't get the return value when the function is called as the result of an event (button press, etc). More on passing arguments to tkinter button command. py Pressing the 3 buttons one after another writes this to the console: Aug 3, 2011 · See Python Argument Binders for standard techniques (not Tkinter-specific) for solving the problem. When the event happens, the callback function is automatically called. value=self. Tkinter : trying to return value from a button. Step-by-step guidance for beginners. At that point, the value should be returned to where the class was originally instantiated. Using activebackground properties. 1. ---This vide Mar 31, 2025 · To bind an event to a function in Tkinter, you need to: Define a function as a callback (this is the action your widget will perform). b['command'] b. The user types a name into the entry field and presses the Continue button. nilaybnrj Unladen Swallow. 6. Dec 16, 2020 · 文章浏览阅读5. Joined: Aug 2018. Tkinter Button command return value? 0. The constructor returns the new Button widget. get_value) self. I am using the tkinter. How to let a tkinter button return it's text value. How do I go about this? I can't seem to make it work in a normal way and am new to Nov 14, 2017 · How to return value from tkinter button callback. Your button doesn't need lambda, though, because you don't need to pass an argument to your RandomFunction(). button = Button(root, text = "I'm a button", command = return entry. Tkinter image button example # The following program shows how to display an image button. import tkinter as tk root = tk. trace_add("write", callback) Mar 28, 2014 · First, you need to make your variable of a Tkinter string type like this: variable = StringVar() Your entry widget is fine, it's connected to the StringVar(). I can propose a solution other than what's in the thread, but it's admittedly not clean. button call to return the number entered so that I don't have to make use of the global. You can use a lambda, or the already mentioned partial method to pass a mutable object, as described by @vnk. Python Tkinter button callback. Ideally I want the tkinter. Creating a Simple Button Click from Tkinter import * class menu: def __init__(self,master): self. quit() ) Code language: Python (python) The button’s command is assigned to a lambda expression that closes the main window. Tk() b = tk. FunctionCall = Button(MainWindow, text='Enter', command=RandomFunction). Jul 1, 2011 · At the time of writing (2017, Python 3. How can I get a value back from the button in my main function? Here is the code: Say I have a function ask_for_number() which is called when a button is pressed. button. The function is supposed to return a path variable from a Treeview node. mainloop () button3. 2. master=master self. Assign that function to the widget’s command option. Prerequisite: Creating a button in tkinter, Python GUI – Tkinter Change the color of the button in Python - Tkin Jun 16, 2017 · I wrote a class method to handle the callback function for a TK Button widget. get_value() self. The code that calls the function (inside of mainloop) ignores the return value. The suggested form now seems to be: sv. pack(side=TOP) def get Jul 10, 2015 · Python Tkinter button callback. Button(root, text='btn', command=lambda:print('foo')) both. mainloop() What I'm trying to figure out is how to rewrite that return statement so that it is valid for the command argument. I can't just put the assignment in the button callback function, because that would be local within the callback function and would be lost. This allows you to capture any return value within the function itself. 6) the docs suggest that . 阅读更多：Tkinter 教程 1. Its options include:. button. get()) #Does not work, you can't do this in a callback. Apr 7, 2015 · I need a tkinter Button to assign a value to a variable, but I can't figure out how. It creates a Toplevel window with a label that says 'Enter a… How to return value from tkinter button callback. button = Button(self. Threads: 3. Tkinter Button command return value? 4. Setting a return on a function to be different depending on button clicked in tkinter. var1 = StringVar() self. net Nov 19, 2024 · If you need to simulate a return value after the button press, you can call the button's `invoke()` method, which triggers the command directly, as if the user clicked the button. I am unable to fetch return value from a function Dec 31, 2013 · To create a pushbutton in a top-level window or frame named parent: w = tk. Anyone any ideas ? See full list on pythontutorial. My issue is that I simply need to use the tkinter window to return a value upon pressing the OK button on the form, which will also close down the form. Using lambdas (or partially applied functions) is the usual way to pass arguments to Tkinter Aug 14, 2018 · I'm using code where I need to ask the user for input, using a tkinter window (I'm not using tkinter in other parts of the code). Button (text = 'Button 3', command = lambda: callback (3)). Tkinter passing callback function result to another class. If other parts of the code need the value, you need to store it as an attribute of an object or as a global variable. Python: Tkinter OK button callback function. 3. master,textvariable=self. pack() root. Apr 7, 2015 · I want to create an instance of this class within my main code and wait for the return value. Jul 23, 2014 · i need to make this for 6 buttons If each button modifies the same global variable, then have make_something accept a value parameter:. Learn how to handle return values from functions when they are triggered by button clicks in Python Tkinter. 引言. 3k次，点赞4次，收藏23次。这篇博客介绍了在Python Tkinter中如何从Button的回调函数中获取变量值。作者通过示例代码展示了在点击Button后如何正确获取并保存文件路径，讨论了mainloop的工作原理以及组件销毁的影响。 Apr 11, 2022 · I need to ask the user for an arbitrarily long list of key-folder pairs, so I use Toplevel to create a popup where i lay out a growable list pairs of custom buttons (one to bind the key and one to select the folder). var2 = StringVar() self. Posts: 4. 0. pack root. pack() Tkinter中在command中使用函数并返回值的方法. button (see below) to enter some numbers into a variable. I’d then like to wait til the user closes the window and read the status on the widgets, but wait_window() waits until it’s too late and the widgets are already deconstructed Nov 6, 2012 · I know how to make a callback function for an individual button, but I am not sure how I would go about implementing a callback function for each of these 64 buttons so that, when pressed, they will return their position in the grid. Reputation: 0 #1. Button( root, text= 'Exit', command= lambda: root. Button(parent, option=value, ). I'm using Python 2. 6, tkinter version 8. Working with callbacks in Tkinter (or other GUI frameworks) has some special considerations because the return value from the callback is useless. It can be done with two methods: Using bg properties. master,text='Hit Me',command = self. I can print the path from the function and it has what I need, but for the life of me I can't figure out how to return that back to my main function. ivlspcpwxeoqgtghzzyoniqphoihpwawgfqjwevzdjyylybnbsgibkbscylfpewrymzxaypfyvkerfsyxfa